Loss of control Accident Aerospool WT-9 Dynamic OM-DYF, Thursday 27 October 2016
ASN logo
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information. If you feel this information is incomplete or incorrect, you can submit corrected information.

Date:Thursday 27 October 2016
Type:Silhouette image of generic WT9 model; specific model in this crash may look slightly different    
Aerospool WT-9 Dynamic
Registration: OM-DYF
MSN: DY-507/2014LSA
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Destroyed
Location:2NM south from LZPE -   Slovakia
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:Prievidza Airport (LZPE)
Destination airport:Prievidza Airport (LZPE)
Investigating agency: LNVU
Confidence Rating: Accident investigation report completed and information captured
On 27 October 2016 during a test flight of intentional tail spins for the purpose of verifying the fulfilment of the CS - LSA certification specification, a pilot with a WT9 Dynamic LSA / Club type airplane, registration number OM-DYF (hereinafter referred to as WT9), after a standard tail spin after one turn and the performance of a standard negotiation, continued in the tail spin. The airplane did not even react to the pilot's next attempt to perform a standard way of negotiation. During the airplane take-off, he probably went into a flat tail spin and even the subsequent pilot's interventions, including the use of a spin-recovery parachute which did not open, were not successful and the rotation was not stopped. The pilot left the airplane by jumping with a back-type rescue parachute and he landed uninjured. The airplane hit a field in the cadastral area of the village of Koš-Laskár. The airplane fall did not cause anyone any injuries. The airplane was destroyed during this air event.

Cause of the aviation accident
- the WT9 airplane, in the FG912T configuration type, did not have a tendency to negotiate left tail spins.
- the definite cause of the ineffectiveness of the standard way of left tail spin negotiation after 1 turn could not be detected;
- the combination of several impacts on the characteristics of left tail spin negotiation at the maximum weight and a rear center of gravity was the probable cause;
- the deflection of the directional rudder did not induce a sufficient moment to stop the rotation probably due to the lesser efficiency induced by the airplane position in the tail spin which corresponded to the flat tail spin;
- the original unadjusted altitude rudders were used.

Accident investigation:
Investigating agency: LNVU
Report number: 
Status: Investigation completed
Duration: 5 months
Download report: Final report



Revision history:

28-Oct-2016 18:00 guiness Added
28-Oct-2016 18:08 Anon. Updated [Aircraft type, Operator, Total fatalities, Total occupants, Source, Narrative]
30-Oct-2016 11:41 Anon. Updated [Cn]
30-Aug-2018 19:41 harro Updated [Other fatalities, Narrative, Accident report, ]
17-Nov-2022 19:45 harro Updated [Departure airport, Destination airport, Narrative, Category]

Corrections or additions? ... Edit this accident description

The Aviation Safety Network is an exclusive service provided by:
Quick Links:

CONNECT WITH US: FSF on social media FSF Facebook FSF Twitter FSF Youtube FSF LinkedIn FSF Instagram

©2024 Flight Safety Foundation

1920 Ballenger Av, 4th Fl.
Alexandria, Virginia 22314